What is the term for the phenomenon where the binding of one oxygen molecule to hemoglobin increases the affinity for subsequent oxygen molecules?

A Positive cooperativity ✓
B Negative cooperativity
C Allosteric regulation
D Heme-heme interaction

Explanation

Positive cooperativity refers to the phenomenon where the binding of one oxygen molecule to hemoglobin increases the affinity for subsequent oxygen molecules, which is essential for efficient oxygen transport.

Source

Alberts et al. Molecular Biology of the Cell
Hematology Hematology: Hemoglobin and Oxygen Transport Hematology: Hemoglobin and Oxygen Transport Hard MEDICAL Confidence: high